101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2014 Red Hat, Inc.
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* Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
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*/
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/*\
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* [Description]
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*
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* Test if SysV IPC shared memory is properly working between two different
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* namespaces.
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*
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* [Algorithm]
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*
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* 1. Clones two child processes with CLONE_NEWIPC flag, each child
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* allocates System V shared memory segment (shm) with the _identical_
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* key and attaches that segment into its address space.
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* 2. Child1 writes into the shared memory segment.
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* 3. Child2 writes into the shared memory segment.
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* 4. Writes to the shared memory segment with the identical key but from
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* two different IPC namespaces should not interfere with each other
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* and so child1 checks whether its shared segment wasn't changed
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* by child2, if it wasn't test passes, otherwise test fails.
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*/
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#define _GNU_SOURCE
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#include <sys/wait.h>
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#include <sys/msg.h>
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#include <sys/types.h>
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#include "tst_safe_sysv_ipc.h"
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#include "tst_test.h"
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#include "common.h"
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#define TESTKEY 124426L
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#define SHMSIZE 50
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static int chld1_shm(LTP_ATTRIBUTE_UNUSED void *arg)
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{
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int id;
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char *shmem;
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id = SAFE_SHMGET(TESTKEY, SHMSIZE, IPC_CREAT);
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shmem = SAFE_SHMAT(id, NULL, 0);
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*shmem = 'A';
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TST_CHECKPOINT_WAKE_AND_WAIT(0);
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if (*shmem != 'A')
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tst_res(TFAIL, "shared memory leak between namespaces");
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else
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tst_res(TPASS, "shared memory didn't leak between namespaces");
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TST_CHECKPOINT_WAKE(0);
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SAFE_SHMDT(shmem);
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SAFE_SHMCTL(id, IPC_RMID, NULL);
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return 0;
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}
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static int chld2_shm(LTP_ATTRIBUTE_UNUSED void *arg)
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{
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int id;
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char *shmem;
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id = SAFE_SHMGET(TESTKEY, SHMSIZE, IPC_CREAT);
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shmem = SAFE_SHMAT(id, NULL, 0);
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TST_CHECKPOINT_WAIT(0);
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*shmem = 'B';
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TST_CHECKPOINT_WAKE_AND_WAIT(0);
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SAFE_SHMDT(shmem);
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SAFE_SHMCTL(id, IPC_RMID, NULL);
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return 0;
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}
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static void run(void)
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{
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clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld1_shm, NULL);
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clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld2_shm, NULL);
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}
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static void setup(void)
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{
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check_newipc();
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}
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static struct tst_test test = {
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.test_all = run,
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.setup = setup,
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.needs_root = 1,
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.needs_checkpoints = 1,
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};
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